Phosphine is generally prepared in the laboratory
A
By decomposition of $$P_2H_4$$ at $$110^oC$$
B
By heating phosphorus in a current of hydrogen
C
By heating white phosphorus with aqueous solution of caustic potash
D
By heating red phosphorus with an aqueous solution of caustic soda
Correct option is B. By heating white phosphorus with aqueous solution of caustic potash
Phosphine is generally prepared in the laboratory by heating white phosphorus with an aqueous solution of caustic potash. The reaction is as follows:
$$P_4 +3NaOH +3H_2O \to PH_3+3NaH_2PO_2$$
White Phosphine